Category Archives: AWS

This days I’m involve with Amazon’s AWS and since I am migrating my backends to Lumen I’m going to play a little bit with AWS and Lumen. Today I want to create a simple Lumen server to handle SNS notifications. One end-point to listen to SNS and another one to emit notifications. I also want to register logs within CloudWatch. Let’s start.

Today I want to create an UI5/OpenUI5 boilerplate that plays with Lumen backends. Simple, isn’t it? We only need to create a Lumen API server and connect our OpenUI5 application with this API server. But today I also want to create a Login also. The typical user/password input form. I don’t want to build it from scratch (a user database, oauth provider or something like that). Since this days I’m involved with Amazon AWS projects I want to try Amazon Cognito.

Cognito has a great javaScript SDK. In fact we can do all the authentication flow (create users, validate passwords, change password, multifactor authentication, …) with Cognito. To create this project first I’ve create the following steps within Amazon AWS Cognito Console: Create a user pool with required attributes (email only in this example), without MFA and only allow administrators to create users. I’ve also created a App client inside this pool, so I’ve got a UserPoolId and a ClientId.

Let’s start with the OpenUI5 application. I’ve created an small application with one route called “home”. To handle the login process I will work in Component.js init function. The idea is check the cognito session. If there’s an active one (that’s means a Json Web Token stored in the local storage) we’ll display to “home” route and if there isn’t we’ll show login one.

It has three different stages: “login”, “PasswordReset” and “newPasswordRequired”
“login” is the main one. In this stage the user can input his login credentials. If credentials are OK then we’ll display home route.
The first time a user log in in the application with the password provided by the administrator, Cognito will force to change the password. Then We’ll show newPasswordRequired flow. I’m not going to explain each step. We developers prefer code than texts. That’s the code:

That means that we need to fetch this url within every backend request, and that’s not cool. spomky-labs/jose allows us to use a cache to avoid fetch the request again and again. This cache is an instance of something that implementes the interface Psr\Cache\CacheItemPoolInterface. I’m not going to create a Cache from scratch. I’m not crazy. I’ll use symfony/cache here with a Redis adapter